build: add Python dependencies and Docker setup

Dockerfile

@@ -0,0 +1,18 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install uv && uv pip install --system -r requirements.txt
+
+COPY . .
+
+RUN mkdir -p /app/media /app/static
+
+EXPOSE 8000
+
+CMD ["sh", "-c", "python manage.py makemigrations chat && python manage.py migrate --noinput && python manage.py init_admin && python manage.py collectstatic --noinput && daphne -b 0.0.0.0 -p 8000 core.asgi:application"]